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39 * Authors: Archie Cobbs <archie@freebsd.org>
40 * Julian Elischer <julian@freebsd.org>
46 * ng_ether(4) netgraph node type
49 #include <sys/param.h>
50 #include <sys/eventhandler.h>
51 #include <sys/systm.h>
52 #include <sys/kernel.h>
53 #include <sys/malloc.h>
55 #include <sys/errno.h>
57 #include <sys/syslog.h>
58 #include <sys/socket.h>
59 #include <sys/taskqueue.h>
62 #include <net/if_dl.h>
63 #include <net/if_types.h>
64 #include <net/if_arp.h>
65 #include <net/if_var.h>
66 #include <net/if_private.h>
67 #include <net/ethernet.h>
68 #include <net/if_bridgevar.h>
71 #include <netgraph/ng_message.h>
72 #include <netgraph/netgraph.h>
73 #include <netgraph/ng_parse.h>
74 #include <netgraph/ng_ether.h>
76 MODULE_VERSION(ng_ether, 1);
78 #define IFP2NG(ifp) ((ifp)->if_l2com)
80 /* Per-node private data */
82 struct ifnet *ifp; /* associated interface */
83 hook_p upper; /* upper hook connection */
84 hook_p lower; /* lower hook connection */
85 hook_p orphan; /* orphan hook connection */
86 u_char autoSrcAddr; /* always overwrite source address */
87 u_char promisc; /* promiscuous mode enabled */
88 u_long hwassist; /* hardware checksum capabilities */
89 u_int flags; /* flags e.g. really die */
91 typedef struct private *priv_p;
93 /* Hook pointers used by if_ethersubr.c to callback to netgraph */
94 extern void (*ng_ether_input_p)(struct ifnet *ifp, struct mbuf **mp);
95 extern void (*ng_ether_input_orphan_p)(struct ifnet *ifp, struct mbuf *m);
96 extern int (*ng_ether_output_p)(struct ifnet *ifp, struct mbuf **mp);
97 extern void (*ng_ether_attach_p)(struct ifnet *ifp);
98 extern void (*ng_ether_detach_p)(struct ifnet *ifp);
99 extern void (*ng_ether_link_state_p)(struct ifnet *ifp, int state);
101 /* Functional hooks called from if_ethersubr.c */
102 static void ng_ether_input(struct ifnet *ifp, struct mbuf **mp);
103 static void ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m);
104 static int ng_ether_output(struct ifnet *ifp, struct mbuf **mp);
105 static void ng_ether_attach(struct ifnet *ifp);
106 static void ng_ether_detach(struct ifnet *ifp);
107 static void ng_ether_link_state(struct ifnet *ifp, int state);
109 /* Other functions */
110 static int ng_ether_rcv_lower(hook_p node, item_p item);
111 static int ng_ether_rcv_upper(hook_p node, item_p item);
113 /* Netgraph node methods */
114 static ng_constructor_t ng_ether_constructor;
115 static ng_rcvmsg_t ng_ether_rcvmsg;
116 static ng_shutdown_t ng_ether_shutdown;
117 static ng_newhook_t ng_ether_newhook;
118 static ng_rcvdata_t ng_ether_rcvdata;
119 static ng_disconnect_t ng_ether_disconnect;
120 static int ng_ether_mod_event(module_t mod, int event, void *data);
122 static eventhandler_tag ng_ether_ifnet_arrival_cookie;
124 /* List of commands and how to convert arguments to/from ASCII */
125 static const struct ng_cmdlist ng_ether_cmdlist[] = {
128 NGM_ETHER_GET_IFNAME,
131 &ng_parse_string_type
135 NGM_ETHER_GET_IFINDEX,
142 NGM_ETHER_GET_ENADDR,
145 &ng_parse_enaddr_type
149 NGM_ETHER_SET_ENADDR,
151 &ng_parse_enaddr_type,
156 NGM_ETHER_GET_PROMISC,
163 NGM_ETHER_SET_PROMISC,
165 &ng_parse_int32_type,
170 NGM_ETHER_GET_AUTOSRC,
177 NGM_ETHER_SET_AUTOSRC,
179 &ng_parse_int32_type,
186 &ng_parse_enaddr_type,
193 &ng_parse_enaddr_type,
206 static struct ng_type ng_ether_typestruct = {
207 .version = NG_ABI_VERSION,
208 .name = NG_ETHER_NODE_TYPE,
209 .mod_event = ng_ether_mod_event,
210 .constructor = ng_ether_constructor,
211 .rcvmsg = ng_ether_rcvmsg,
212 .shutdown = ng_ether_shutdown,
213 .newhook = ng_ether_newhook,
214 .rcvdata = ng_ether_rcvdata,
215 .disconnect = ng_ether_disconnect,
216 .cmdlist = ng_ether_cmdlist,
218 NETGRAPH_INIT(ether, &ng_ether_typestruct);
220 /******************************************************************
222 ******************************************************************/
224 ng_ether_sanitize_ifname(const char *ifname, char *name)
228 for (i = 0; i < IFNAMSIZ; i++) {
229 if (ifname[i] == '.' || ifname[i] == ':')
238 /******************************************************************
239 ETHERNET FUNCTION HOOKS
240 ******************************************************************/
243 * Handle a packet that has come in on an interface. We get to
244 * look at it here before any upper layer protocols do.
247 ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
249 const node_p node = IFP2NG(ifp);
250 const priv_p priv = NG_NODE_PRIVATE(node);
253 /* If "lower" hook not connected, let packet continue */
254 if (priv->lower == NULL)
256 NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */
260 * Handle a packet that has come in on an interface, and which
261 * does not match any of our known protocols (an ``orphan'').
264 ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
266 const node_p node = IFP2NG(ifp);
267 const priv_p priv = NG_NODE_PRIVATE(node);
270 /* If "orphan" hook not connected, discard packet */
271 if (priv->orphan == NULL) {
275 NG_SEND_DATA_ONLY(error, priv->orphan, m);
279 * Handle a packet that is going out on an interface.
280 * The Ethernet header is already attached to the mbuf.
283 ng_ether_output(struct ifnet *ifp, struct mbuf **mp)
285 const node_p node = IFP2NG(ifp);
286 const priv_p priv = NG_NODE_PRIVATE(node);
289 /* If "upper" hook not connected, let packet continue */
290 if (priv->upper == NULL)
293 /* Send it out "upper" hook */
294 NG_OUTBOUND_THREAD_REF();
295 NG_SEND_DATA_ONLY(error, priv->upper, *mp);
296 NG_OUTBOUND_THREAD_UNREF();
301 * A new Ethernet interface has been attached.
302 * Create a new node for it, etc.
305 ng_ether_attach(struct ifnet *ifp)
312 * Do not create / attach an ether node to this ifnet if
313 * a netgraph node with the same name already exists.
314 * This should prevent ether nodes to become attached to
315 * eiface nodes, which may be problematic due to naming
318 ng_ether_sanitize_ifname(ifp->if_xname, name);
319 if ((node = ng_name2noderef(NULL, name)) != NULL) {
325 KASSERT(!IFP2NG(ifp), ("%s: node already exists?", __func__));
326 if (ng_make_node_common(&ng_ether_typestruct, &node) != 0) {
327 log(LOG_ERR, "%s: can't %s for %s\n",
328 __func__, "create node", ifp->if_xname);
332 /* Allocate private data */
333 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
335 log(LOG_ERR, "%s: can't %s for %s\n",
336 __func__, "allocate memory", ifp->if_xname);
340 NG_NODE_SET_PRIVATE(node, priv);
343 priv->hwassist = ifp->if_hwassist;
345 /* Try to give the node the same name as the interface */
346 if (ng_name_node(node, name) != 0)
347 log(LOG_WARNING, "%s: can't name node %s\n", __func__, name);
351 * An Ethernet interface is being detached.
352 * REALLY Destroy its node.
355 ng_ether_detach(struct ifnet *ifp)
357 const node_p node = IFP2NG(ifp);
358 const priv_p priv = NG_NODE_PRIVATE(node);
360 taskqueue_drain(taskqueue_swi, &ifp->if_linktask);
361 NG_NODE_REALLY_DIE(node); /* Force real removal of node */
363 * We can't assume the ifnet is still around when we run shutdown
364 * So zap it now. XXX We HOPE that anything running at this time
365 * handles it (as it should in the non netgraph case).
368 priv->ifp = NULL; /* XXX race if interrupted an output packet */
369 ng_rmnode_self(node); /* remove all netgraph parts */
373 * Notify graph about link event.
374 * if_link_state_change() has already checked that the state has changed.
377 ng_ether_link_state(struct ifnet *ifp, int state)
379 const node_p node = IFP2NG(ifp);
380 const priv_p priv = NG_NODE_PRIVATE(node);
382 int cmd, dummy_error = 0;
384 if (state == LINK_STATE_UP)
385 cmd = NGM_LINK_IS_UP;
386 else if (state == LINK_STATE_DOWN)
387 cmd = NGM_LINK_IS_DOWN;
391 if (priv->lower != NULL) {
392 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
394 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->lower, 0);
396 if (priv->orphan != NULL) {
397 NG_MKMESSAGE(msg, NGM_FLOW_COOKIE, cmd, 0, M_NOWAIT);
399 NG_SEND_MSG_HOOK(dummy_error, node, msg, priv->orphan, 0);
404 * Interface arrival notification handler.
405 * The notification is produced in two cases:
406 * o a new interface arrives
407 * o an existing interface got renamed
408 * Currently the first case is handled by ng_ether_attach via special
409 * hook ng_ether_attach_p.
412 ng_ether_ifnet_arrival_event(void *arg __unused, struct ifnet *ifp)
417 /* Only ethernet interfaces are of interest. */
418 if (ifp->if_type != IFT_ETHER &&
419 ifp->if_type != IFT_L2VLAN &&
420 ifp->if_type != IFT_BRIDGE)
424 * Just return if it's a new interface without an ng_ether companion.
430 /* Try to give the node the same name as the new interface name */
431 ng_ether_sanitize_ifname(ifp->if_xname, name);
432 if (ng_name_node(node, name) != 0)
433 log(LOG_WARNING, "%s: can't re-name node %s\n", __func__, name);
436 /******************************************************************
437 NETGRAPH NODE METHODS
438 ******************************************************************/
441 * It is not possible or allowable to create a node of this type.
442 * Nodes get created when the interface is attached (or, when
443 * this node type's KLD is loaded).
446 ng_ether_constructor(node_p node)
452 * Check for attaching a new hook.
455 ng_ether_newhook(node_p node, hook_p hook, const char *name)
457 const priv_p priv = NG_NODE_PRIVATE(node);
460 /* Divert hook is an alias for lower */
461 if (strcmp(name, NG_ETHER_HOOK_DIVERT) == 0)
462 name = NG_ETHER_HOOK_LOWER;
465 if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0) {
466 hookptr = &priv->upper;
467 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_upper);
468 NG_HOOK_SET_TO_INBOUND(hook);
469 } else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
470 hookptr = &priv->lower;
471 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
472 } else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
473 hookptr = &priv->orphan;
474 NG_HOOK_SET_RCVDATA(hook, ng_ether_rcv_lower);
478 /* Check if already connected (shouldn't be, but doesn't hurt) */
479 if (*hookptr != NULL)
482 /* Disable hardware checksums while 'upper' hook is connected */
483 if (hookptr == &priv->upper)
484 priv->ifp->if_hwassist = 0;
485 NG_HOOK_HI_STACK(hook);
492 * Receive an incoming control message.
495 ng_ether_rcvmsg(node_p node, item_p item, hook_p lasthook)
497 const priv_p priv = NG_NODE_PRIVATE(node);
498 struct ng_mesg *resp = NULL;
502 NGI_GET_MSG(item, msg);
503 switch (msg->header.typecookie) {
504 case NGM_ETHER_COOKIE:
505 switch (msg->header.cmd) {
506 case NGM_ETHER_GET_IFNAME:
507 NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_NOWAIT);
512 strlcpy(resp->data, priv->ifp->if_xname, IFNAMSIZ);
514 case NGM_ETHER_GET_IFINDEX:
515 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
520 *((u_int32_t *)resp->data) = priv->ifp->if_index;
522 case NGM_ETHER_GET_ENADDR:
523 NG_MKRESPONSE(resp, msg, ETHER_ADDR_LEN, M_NOWAIT);
528 bcopy(IF_LLADDR(priv->ifp),
529 resp->data, ETHER_ADDR_LEN);
531 case NGM_ETHER_SET_ENADDR:
533 if (msg->header.arglen != ETHER_ADDR_LEN) {
537 error = if_setlladdr(priv->ifp,
538 (u_char *)msg->data, ETHER_ADDR_LEN);
541 case NGM_ETHER_GET_PROMISC:
542 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
547 *((u_int32_t *)resp->data) = priv->promisc;
549 case NGM_ETHER_SET_PROMISC:
553 if (msg->header.arglen != sizeof(u_int32_t)) {
557 want = !!*((u_int32_t *)msg->data);
558 if (want ^ priv->promisc) {
559 if ((error = ifpromisc(priv->ifp, want)) != 0)
561 priv->promisc = want;
565 case NGM_ETHER_GET_AUTOSRC:
566 NG_MKRESPONSE(resp, msg, sizeof(u_int32_t), M_NOWAIT);
571 *((u_int32_t *)resp->data) = priv->autoSrcAddr;
573 case NGM_ETHER_SET_AUTOSRC:
574 if (msg->header.arglen != sizeof(u_int32_t)) {
578 priv->autoSrcAddr = !!*((u_int32_t *)msg->data);
580 case NGM_ETHER_ADD_MULTI:
582 struct sockaddr_dl sa_dl;
583 struct epoch_tracker et;
584 struct ifmultiaddr *ifma;
586 if (msg->header.arglen != ETHER_ADDR_LEN) {
590 bzero(&sa_dl, sizeof(struct sockaddr_dl));
591 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
592 sa_dl.sdl_family = AF_LINK;
593 sa_dl.sdl_alen = ETHER_ADDR_LEN;
594 bcopy((void *)msg->data, LLADDR(&sa_dl),
597 * Netgraph is only permitted to join groups once
598 * via the if_addmulti() KPI, because it cannot hold
599 * struct ifmultiaddr * between calls. It may also
600 * lose a race while we check if the membership
604 ifma = if_findmulti(priv->ifp,
605 (struct sockaddr *)&sa_dl);
610 error = if_addmulti(priv->ifp,
611 (struct sockaddr *)&sa_dl, &ifma);
615 case NGM_ETHER_DEL_MULTI:
617 struct sockaddr_dl sa_dl;
619 if (msg->header.arglen != ETHER_ADDR_LEN) {
623 bzero(&sa_dl, sizeof(struct sockaddr_dl));
624 sa_dl.sdl_len = sizeof(struct sockaddr_dl);
625 sa_dl.sdl_family = AF_LINK;
626 sa_dl.sdl_alen = ETHER_ADDR_LEN;
627 bcopy((void *)msg->data, LLADDR(&sa_dl),
629 error = if_delmulti(priv->ifp,
630 (struct sockaddr *)&sa_dl);
633 case NGM_ETHER_DETACH:
634 ng_ether_detach(priv->ifp);
645 NG_RESPOND_MSG(error, node, item, resp);
651 * Receive data on a hook.
652 * Since we use per-hook recveive methods this should never be called.
655 ng_ether_rcvdata(hook_p hook, item_p item)
659 panic("%s: weird hook", __func__);
663 * Handle an mbuf received on the "lower" or "orphan" hook.
666 ng_ether_rcv_lower(hook_p hook, item_p item)
669 const node_p node = NG_HOOK_NODE(hook);
670 const priv_p priv = NG_NODE_PRIVATE(node);
671 struct ifnet *const ifp = priv->ifp;
676 /* Check whether interface is ready for packets */
678 if (!((ifp->if_flags & IFF_UP) &&
679 (ifp->if_drv_flags & IFF_DRV_RUNNING))) {
684 /* Make sure header is fully pulled up */
685 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
689 if (m->m_len < sizeof(struct ether_header)
690 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
693 /* Drop in the MAC address if desired */
694 if (priv->autoSrcAddr) {
695 /* Make the mbuf writable if it's not already */
697 && (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
700 /* Overwrite source MAC address */
701 bcopy(IF_LLADDR(ifp),
702 mtod(m, struct ether_header *)->ether_shost,
706 /* Send it on its way */
707 return ether_output_frame(ifp, m);
711 * Handle an mbuf received on the "upper" hook.
714 ng_ether_rcv_upper(hook_p hook, item_p item)
717 const node_p node = NG_HOOK_NODE(hook);
718 const priv_p priv = NG_NODE_PRIVATE(node);
719 struct ifnet *ifp = priv->ifp;
724 /* Check length and pull off header */
725 if (m->m_pkthdr.len < sizeof(struct ether_header)) {
729 if (m->m_len < sizeof(struct ether_header) &&
730 (m = m_pullup(m, sizeof(struct ether_header))) == NULL)
733 m->m_pkthdr.rcvif = ifp;
735 /* Pass the packet to the bridge, it may come back to us */
736 if (ifp->if_bridge) {
737 BRIDGE_INPUT(ifp, m);
742 /* Route packet back in */
748 * Shutdown node. This resets the node but does not remove it
749 * unless the REALLY_DIE flag is set.
752 ng_ether_shutdown(node_p node)
754 const priv_p priv = NG_NODE_PRIVATE(node);
756 if (node->nd_flags & NGF_REALLY_DIE) {
758 * The ifnet is going away, perhaps because the driver was
759 * unloaded or its vnet is being torn down.
761 NG_NODE_SET_PRIVATE(node, NULL);
762 if (priv->ifp != NULL)
763 IFP2NG(priv->ifp) = NULL;
764 free(priv, M_NETGRAPH);
765 NG_NODE_UNREF(node); /* free node itself */
768 if (priv->promisc) { /* disable promiscuous mode */
769 (void)ifpromisc(priv->ifp, 0);
772 NG_NODE_REVIVE(node); /* Signal ng_rmnode we are persisant */
778 * Hook disconnection.
781 ng_ether_disconnect(hook_p hook)
783 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
785 if (hook == priv->upper) {
787 if (priv->ifp != NULL) /* restore h/w csum */
788 priv->ifp->if_hwassist = priv->hwassist;
789 } else if (hook == priv->lower)
791 else if (hook == priv->orphan)
794 panic("%s: weird hook", __func__);
795 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
796 && (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
797 ng_rmnode_self(NG_HOOK_NODE(hook)); /* reset node */
801 /******************************************************************
803 ******************************************************************/
806 * Handle loading and unloading for this node type.
809 ng_ether_mod_event(module_t mod, int event, void *data)
816 /* Register function hooks */
817 if (ng_ether_attach_p != NULL) {
821 ng_ether_attach_p = ng_ether_attach;
822 ng_ether_detach_p = ng_ether_detach;
823 ng_ether_output_p = ng_ether_output;
824 ng_ether_input_p = ng_ether_input;
825 ng_ether_input_orphan_p = ng_ether_input_orphan;
826 ng_ether_link_state_p = ng_ether_link_state;
828 ng_ether_ifnet_arrival_cookie =
829 EVENTHANDLER_REGISTER(ifnet_arrival_event,
830 ng_ether_ifnet_arrival_event, NULL, EVENTHANDLER_PRI_ANY);
836 * Note that the base code won't try to unload us until
837 * all nodes have been removed, and that can't happen
838 * until all Ethernet interfaces are removed. In any
839 * case, we know there are no nodes left if the action
840 * is MOD_UNLOAD, so there's no need to detach any nodes.
843 EVENTHANDLER_DEREGISTER(ifnet_arrival_event,
844 ng_ether_ifnet_arrival_cookie);
846 /* Unregister function hooks */
847 ng_ether_attach_p = NULL;
848 ng_ether_detach_p = NULL;
849 ng_ether_output_p = NULL;
850 ng_ether_input_p = NULL;
851 ng_ether_input_orphan_p = NULL;
852 ng_ether_link_state_p = NULL;
863 vnet_ng_ether_init(const void *unused)
867 /* If module load was rejected, don't attach to vnets. */
868 if (ng_ether_attach_p != ng_ether_attach)
871 /* Create nodes for any already-existing Ethernet interfaces. */
873 CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
874 if (ifp->if_type == IFT_ETHER ||
875 ifp->if_type == IFT_L2VLAN ||
876 ifp->if_type == IFT_BRIDGE)
877 ng_ether_attach(ifp);
881 VNET_SYSINIT(vnet_ng_ether_init, SI_SUB_PSEUDO, SI_ORDER_ANY,
882 vnet_ng_ether_init, NULL);